Heat nonstick 12-inch skillet over medium-high heat until hot. Add ground beef and cook 5 minutes or until meat is no longer pink, breaking up meat with side of spoon. Skim off fat. Stir in chili powder, 2/3 cup salsa, and 1/4 cup water; heat to boiling.

Divide lettuce among 4 dinner plates. Top with beef mixture, beans, Cheddar, remaining salsa, and sour cream if using. Arrange tortilla chips on plate around salad. Garnish with fresh cilantro leaves. Use chips to scoop up beef mixture or to crumble over top of salad.

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